Chinese is becoming more and more popular. It in many schools in foreign countries.A. tea

问题补充：

Chinese is becoming more and more popular. It in many schools in foreign countries.

A. teaches

B. is teaching

C. is taught

D. has taught

答案：

A. teaches

B. is teaching

(答案→)C. is taught

D. has taught

解析：根据第一句内容Chinese is becoming more and more popular.故第二空it为C

Hinese,故用被动语态，其结构为主语+be+过去分词，故选答案为C